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<p>This study examines the bioremoval of multiple heavy metals by five bacterial strains which include <i>Enterobacter cloacae</i> ES38G, <i>Kurthia gibsonii</i> ES43G, <i>Kluyvera cryocrescens</i> ES45G, <i>Aeromonas caviae</i> ES50G, and <i>Comamonas aquatica</i> ES54G. The bioremoval rates by ES38G, ES43G, ES45G, ES50G, and ES54G were significantly influenced by metal concentration, contact time, pH, temperature, and bacterial strains. For example, ES43G removed 100% Ni at 5 and 50&#xa0;mg/L. ES43G, ES45G, and ES54G completely (100%) removed Cr, while ES43G, ES50G and ES54G achieved 100% Cd removal when exposed to 5 and 50&#xa0;mg/L. Complete Pb removal (100%) was recorded for ES43G and ES54G at 5, 50, and 100&#xa0;mg/L. At pH 6, ES43G, ES45G and ES54G achieved 100% Ni removal. ES43G also removed 100% Ni at pH 7. ES43G and ES45G removed 100% Cr at pH 5–7, while 100% Cr was removed by ES50G at pH 6 and ES54G at pH 5 and 7. ES43G, ES45G and ES54G completely removed Pb at pH 7–8, while ES54G and ES50G removed 100% Pb at pH 6 and pH 7, respectively. ES43G and ES54G also removed 100% Cd both at pH 6 and 7, while ES45G and ES50G removed 100% Cd at pH 6 and 7, respectively. However, bioremoval efficiencies of all these strains markedly decreased at 22&#xa0;°C and 37&#xa0;°C compared to 28&#xa0;°C. Fourier transform infrared spectroscopy revealed that functional groups such as C = O, N–H, COO⁻, and P = O were actively involved in metal biosorption. Therefore, these bacterial strains exhibit strong potential for application in the bioremoval of heavy metals from wastewater.</p>

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Bioremoval of lead, cadmium, chromium, and nickel by multi-metal tolerant Kurthia gibsonii ES43G, Kluyvera cryocrescens ES45G and Comamonas aquatica ES54G

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Md. Manjurul Haque,
  • Sudershon Sanyal,
  • Md. Golam Shaharia Limon,
  • Farzana Yasmin,
  • Md Khaled Mosharaf,
  • Habibul Bari Shozib

摘要

This study examines the bioremoval of multiple heavy metals by five bacterial strains which include Enterobacter cloacae ES38G, Kurthia gibsonii ES43G, Kluyvera cryocrescens ES45G, Aeromonas caviae ES50G, and Comamonas aquatica ES54G. The bioremoval rates by ES38G, ES43G, ES45G, ES50G, and ES54G were significantly influenced by metal concentration, contact time, pH, temperature, and bacterial strains. For example, ES43G removed 100% Ni at 5 and 50 mg/L. ES43G, ES45G, and ES54G completely (100%) removed Cr, while ES43G, ES50G and ES54G achieved 100% Cd removal when exposed to 5 and 50 mg/L. Complete Pb removal (100%) was recorded for ES43G and ES54G at 5, 50, and 100 mg/L. At pH 6, ES43G, ES45G and ES54G achieved 100% Ni removal. ES43G also removed 100% Ni at pH 7. ES43G and ES45G removed 100% Cr at pH 5–7, while 100% Cr was removed by ES50G at pH 6 and ES54G at pH 5 and 7. ES43G, ES45G and ES54G completely removed Pb at pH 7–8, while ES54G and ES50G removed 100% Pb at pH 6 and pH 7, respectively. ES43G and ES54G also removed 100% Cd both at pH 6 and 7, while ES45G and ES50G removed 100% Cd at pH 6 and 7, respectively. However, bioremoval efficiencies of all these strains markedly decreased at 22 °C and 37 °C compared to 28 °C. Fourier transform infrared spectroscopy revealed that functional groups such as C = O, N–H, COO⁻, and P = O were actively involved in metal biosorption. Therefore, these bacterial strains exhibit strong potential for application in the bioremoval of heavy metals from wastewater.